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sources/edt/chmchange.bli
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%TITLE 'CHMCHANGE - change mode execution'
MODULE CHMCHANGE ( ! Change mode execution
IDENT = '3-006' ! File: CHMCHANGE.BLI Edit: CJG3006
) =
BEGIN
!
! COPYRIGHT (c) 1981, 1985 BY
! DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
! ALL RIGHTS RESERVED.
!
! THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
! ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE
! INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR ANY OTHER
! COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
! OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY
! TRANSFERRED.
!
! THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE
! AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
! CORPORATION.
!
! DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
! SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.
!
!++
! FACILITY: EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
! This module contains the main routine for change mode execution.
!
! ENVIRONMENT: Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: Unknown
!
! MODIFIED BY:
!
! 1-001 - Original. DJS 04-Feb-1981. This module was created by
! extracting the routine EDT$$CHM_EXE from module CHANGE.BLI.
! 1-002 - Regularize headers and remove control C. JBS 27-Feb-1981
! 1-003 - Fix module name. JBS 02-Mar-1981
! 1-004 - Revise journaling. JBS 22-Jun-1981
! 1-005 - Fix a journaling bug. JBS 08-Jul-1981
! 1-006 - Use EDT$_ for message codes. JBS 04-Aug-1981
! 1-007 - Fix a comment which stated that EDT$$GZ_COMMAND_RAB is an implicit input;
! actually, it is not used. JBS 16-Aug-1981
! 1-008 - Return if the journal file terminates, and tell the caller. JBS 01-Oct-1981
! 1-009 - Change EOB to user defined string. STS 06-Oct-1981
! 1-010 - Change literal prompt to use global string. JBS 20-Oct-1981
! 1-011 - Remove length of prompt string. JBS 23-Oct-1981
! 1-012 - Add control C handling. JBS 21-Dec-1981
! 1-013 - Debug control C handling. JBS 24-Dec-1981
! 1-014 - Add JOU_VALID. JBS 09-Apr-1982
! 1-015 - Simplify the call to EDT$$SC_RESET. JBS 22-Apr-1982
! 1-016 - Add alternative control C message. JBS 25-May-1982
! 1-017 - Clear EXI before exiting. JBS 02-Jun-1982
! 1-018 - Clear error indicator after an error in hardcopy
! 1-019 - Remove reference to SET_FMTWRRUT and other message changes.
! SMB 29-Jun-1982
! 1-020 - Make FIRST_TIME_ENTERED a global. SMB 1-Jul-1982
! 1-021 - Remove CHM_FRST_ENTRY, use instead LASTMSG. JBS 05-Jul-1982
! 1-022 - Remove EDT$$G_LN_NO. SMB 24-Sep-1982
! 1-023 - Change the call to screen update and add a LOAD entry point, so this module
! can be displaced by the screen update modules on the PDP-11. JBS 25-Sep-1982
! 1-024 - Change the screen update call again, to improve overlay size. JBS 27-Sep-1982
! 1-025 - Remove the call to SC_INIT, set a flag instead. SMB 06-Oct-1982
! 1-026 - Convert to new journalling scheme. STS 06-Oct-1982
! 1-027 - Change the name of the cursor positioning routine, to obsolete a
! redundent module. JBS 07-Oct-1982
! 1-028 - Correct a comment. JBS 09-Oct-1982
! 1-029 - Set EDT$$G_SCR_REBUILD on exit, so line mode will be more efficient. JBS 21-Oct-1982
! 1-030 - First time through - ignore typeahead. STS 10-Nov-1982
! 1-031 - First time through - don't update screen if typeahead. STS 01-Dec-1982
! 1-032 - Clear screen first time through. STS 02-Dec-1982
! 1-033 - Fix problem with hardcopy recoveries. STS 13-Dec-1982
! 1-034 - Only initialize the screen once. JBS 20-Dec-1982
! 1-035 - Be more careful about printing the owed message. JBS 18-Jan-1983
! 1-036 - Don't call EDT$$ERA_MSGLN unnecessarily. JBS 20-Jan-1983
! 1-037 - Don't call EDT$$RD_ECHO unnecessarily. JBS 21-Jan-1983
! 1-038 - Only update the screen for every 10 characters when doing
! a recovery. JBS 21-Jan-1983
! 1-039 - Add new value for EDT$$G_SCR_CHGD. JBS 02-Mar-1983
! Start of modifications for TOPS10/20.
! 3-001 - Fix EDT$$FMT_STR. CJG 22-Mar-1983
! 3-002 - Add updates from V3 source kit. GB 26-Apr-1983
! 3-003 - Modify to use EDT$$TI_BUFSTR for journalling. CJG 15-Jun-1983
! 3-004 - Fix problem in handling of nokeypad commands with CHANGE command.
! CJG 13-Dec-1983
! 3-005 - Fix a problem with journalling multicommand lines, especially CHANGE\...
! CJG 10-Jan-1984
! 3-006 - Modify ASSERT macro to include error code. CJG 30-Jan-1984
!--
%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!
REQUIRE 'EDTSRC:TRAROUNAM';
FORWARD ROUTINE
EDT$$CHM_EXE; ! Driver for change mode processing
!
! INCLUDE FILES:
!
REQUIRE 'EDTSRC:EDTREQ';
!
! MACROS:
!
! NONE
!
! EQUATED SYMBOLS:
!
! NONE
!
! OWN STORAGE:
!
! NONE
!
! EXTERNAL REFERENCES:
!
! In the routine
%SBTTL 'EDT$$CHM_EXE - change mode execution'
GLOBAL ROUTINE EDT$$CHM_EXE ! Change mode execution
=
!++
! FUNCTIONAL DESCRIPTION:
!
! This is the main routine for change mode execution. First we initialize
! for change mode, then execute any change mode commands on the current
! command line. After we have finished with them, we check to see if an
! exit was done and if so get out. Otherwise we enter into the change mode
! command loop, getting commands and executing them until an exit is done,
! or until the journal file ends.
!
! FORMAL PARAMETERS:
!
! NONE
!
! IMPLICIT INPUTS:
!
! CMD_BUF
! CUR_COL
! CS_LNO
! EXI
! CMD_LEN
! CMD_PTR
! INP_SRC
! RCOV_MOD
! TI_TYP
! LN_BUF
! LN_PTR
! LN_END
! PMT_HCCHG
! CC_DONE
! LASTMSG
! TIN_ECHOFLG
! RECSCRUPD
!
! IMPLICIT OUTPUTS:
!
! EXI
! CMD_END
! CMD_PTR
! CUR_BUF
! EDIT_MOD
! JOU_VALID
! SCR_CHGD
! SCR_REBUILD
! RECSCRUPD
!
! ROUTINE VALUE:
!
! 1 = reached the end of the journal file
! 0 = executed an exit command
!
! SIDE EFFECTS:
!
! MANY
!
!--
BEGIN
EXTERNAL ROUTINE
EDT$$MSG_BELL : NOVALUE, ! Output a message to the terminal with a warning bell
EDT$$SC_POSCSIF, ! Absolute cursor positioning
EDT$$RD_ECHO, ! Try to optimize terminal input
EDT$$INIT_CHM : NOVALUE, ! Initialization on entering change mode
EDT$$FMT_CH, ! Format a charcter
EDT$$OUT_FMTBUF, ! Dump the format buffer
EDT$$FMT_STR, ! Format a string
EDT$$RD_CMDLN, ! Get a command line
EDT$$TI_BUFCH : NOVALUE, ! Put a character in the journal file buffer
EDT$$TI_BUFSTR : NOVALUE, ! Put string in journal file
EDT$$TI_FLUSHJOUFI : NOVALUE, ! Empty the journal file's buffer
EDT$$RD_JOUTXT, ! Read a text record from the journal file
EDT$$TI_WRLN, ! Write to terminal
EDT$$TI_WRSTR, ! Write to terminal unformatted
EDT$$GET_KPADCMD, ! Get a keypad command
EDT$$FMT_TEXT : NOVALUE, ! output eob string
EDT$$RPL_CHGDLN, ! Declare current line as changed
EDT$$CHM_PAREXE, ! Parse and execute a change mode command string
EDT$$SC_INIT, ! Initialize for screen mode
EDT$$SC_ERAALL, ! Erase the screen
EDT$$SC_RESET, ! Reset screen parameters
EDT$$SC_UPD, ! Update the screen
EDT$$START_WKINGMSG, ! Set up working AST
EDT$$STOP_WKINGMSG, ! Terminate working AST
EDT$$FMT_MSG, ! Print message text
EDT$$ERA_MSGLN, ! Start command echoing
EDT$$TI_TSTTYAHED, ! Check for type ahead
EDT$$TST_EOB, ! Check for end of buffer
EDT$$CHK_CC, ! Check for control C
EDT$$CLR_CC : NOVALUE; ! Clear control C flag
EXTERNAL
EDIT_DFLTMOD, ! Editing default mode
PUT_JOU, !
MESSAGE_LINE, ! Error message line is 1 more
MSGFLG, ! 1 = there is a message on the last line
LASTMSG, ! The last message printed
FMT_WRRUT, ! Holds address of write routine
CMD_BUF, ! Command string buffer
PA_MORE, ! Non-zero = more command in buffer
PA_CURTOK, ! Pointer to remainder of command
PA_CURTOKLEN, ! Length of remainder
CUR_COL, ! current column
CS_LNO, ! cursor line.
EXI, ! Change mode has been exited.
CMD_END, ! End of command pointer
CMD_LEN, ! Length of command buffer
CMD_PTR, ! Command string pointer
INP_SRC, ! Source of command input.
RCOV_MOD, ! In recovery mode?
CUR_BUF : REF TBCB_BLOCK, ! The current buffer tbcb
TI_TYP, ! Terminal type.
LN_BUF, ! Current line buffer
LN_PTR, ! Current character pointer
LN_END, ! End of current line pointer
EDIT_MOD, ! Editing mode: line or change
PMT_HCCHG : VECTOR, ! Counted ASCII prompt string for hardcopy change mode
CC_DONE, ! 1 = Control C actually aborted something
JOU_VALID, ! 1 = Journal record is valid
WK_LN : REF LIN_BLOCK,
EOB_LN,
SCR_CHGD, ! The screen must be repainted
SCR_REBUILD, ! The screen must be rebuilt from the work file
TIN_ECHOFLG,
RECSCRUPD; ! Counter for screen updates in recovery mode
LOCAL
FIRST_TIME, ! 1 = first time at least initialise the screen
STATUS, ! 0 = error, 1 = ok, 2 = journal file ended
CC_MSG, ! 0 = no message, 1 = aborted msg, 2 = ignored msg
OWED_MESSAGE; ! 1 = we should print the last message again
!+
! Specify messages used in this routine.
!-
MESSAGES ((CHGMODTER, ABOBYCC, CTRC__IGN));
!+
! Since we entered this routine, we must be in change mode.
!-
ASSERT (2, .EDIT_MOD EQL CHANGE_MODE);
!+
! Perform initialization.
!-
EDT$$INIT_CHM ();
FIRST_TIME = 1;
CC_MSG = 0;
!+
! Execute remainder of command line if there is a backslash.
!-
IF (.PA_MORE)
THEN
BEGIN
PA_MORE = 0;
CMD_PTR = .PA_CURTOK;
CMD_END = CH$PLUS (.PA_CURTOK, .PA_CURTOKLEN - 2);
EDT$$TI_BUFSTR (CH$PTR (CMD_BUF ,,BYTE_SIZE), .CMD_LEN + .PA_CURTOKLEN - 2);
JOU_VALID = 1;
STATUS = EDT$$CHM_PAREXE (1);
END
ELSE
STATUS = 1;
!+
! Make sure any previous commands have been written out to the journal file
!-
IF ( NOT .RCOV_MOD) THEN EDT$$TI_FLUSHJOUFI (%C'T');
!+
! If an exit command was seen, get out now.
!-
IF .EXI
THEN
BEGIN
EDIT_MOD = LINE_MODE;
EDT$$RPL_CHGDLN ();
EXI = 0;
RETURN (0);
END;
!+
! Before entering the command loop, make sure the input is either coming
! from the terminal or from a recovery file. We do not allow the startup
! file or macros to enter change mode.
!-
IF (((.INP_SRC NEQ INP_TERM) AND ( NOT .RCOV_MOD)) OR !
(.TI_TYP EQL TERM_UNKNOWN))
THEN
BEGIN
EDIT_MOD = LINE_MODE;
EDT$$FMT_MSG (EDT$_CHGMODTER);
RETURN (0);
END;
!+
! Set up for change mode editing.
!-
OWED_MESSAGE = 1;
IF ((.TI_TYP EQL TERM_VT52) OR (.TI_TYP EQL TERM_VT100))
THEN
BEGIN
FMT_WRRUT = EDT$$TI_WRSTR;
!+
! Since we are about to refresh the screen, remember if there is a message,
! so we can display it. This lets us display, for example, "Input file does not
! have standard text format" even if the first thing we do is enter change mode.
!-
OWED_MESSAGE = .LASTMSG;
SCR_CHGD = 2;
END;
!+
! Now loop through, getting commands until an exit is seen or the journal file ends.
!-
WHILE ((.EXI EQL 0) AND (.STATUS NEQ 2)) DO
BEGIN
IF .PUT_JOU
THEN
BEGIN
IF ( NOT .RCOV_MOD) THEN EDT$$TI_FLUSHJOUFI (%C'T');
EDT$$CLR_CC ();
PUT_JOU = 0;
END;
!+
! Check for a hardcopy terminal.
!-
IF (.TI_TYP EQL TERM_HCPY)
THEN
BEGIN
!+
! Hard copy change mode. Output a control C message if we owe one.
!-
CASE .CC_MSG FROM 0 TO 2 OF
SET
[0] : ! We don't owe a message
BEGIN
0
END;
[1] : ! The previous operation was aborted by a control C
BEGIN
EDT$$MSG_BELL (EDT$_ABOBYCC);
CC_MSG = 0;
END;
[2] : ! The previous control C was ignored
BEGIN
EDT$$MSG_BELL (EDT$_CTRC__IGN);
CC_MSG = 0;
END;
TES;
!+
! Type the current line with the cursor bracketed.
!-
IF (.WK_LN EQLA EOB_LN)
THEN
EDT$$FMT_TEXT (0)
ELSE
BEGIN
EDT$$FMT_STR (CH$PTR (LN_BUF,, BYTE_SIZE),
CH$DIFF (.LN_PTR, CH$PTR (LN_BUF,, BYTE_SIZE)));
EDT$$FMT_CH (%C'[');
EDT$$FMT_CH (CH$RCHAR (.LN_PTR));
EDT$$FMT_CH (%C']');
IF CH$PTR_NEQ (.LN_PTR, .LN_END)
THEN
EDT$$FMT_STR (CH$PLUS (.LN_PTR, 1), CH$DIFF (.LN_END, .LN_PTR) - 1);
END;
EDT$$OUT_FMTBUF ();
!+
! Now get the next command string.
!-
STATUS = 1;
IF .RCOV_MOD
THEN
BEGIN
IF ( NOT EDT$$RD_JOUTXT (CMD_BUF, CMD_LEN))
THEN
STATUS = 2 ! Journal file ended
ELSE
BEGIN
IF (.CMD_LEN EQL 2)
THEN
IF (CH$RCHAR (CH$PTR (CMD_BUF,, BYTE_SIZE)) EQL %C'^')
THEN
IF ((CH$RCHAR (CH$PTR (CMD_BUF, 1, BYTE_SIZE)) EQL %C'Z') OR !
(CH$RCHAR (CH$PTR (CMD_BUF, 1, BYTE_SIZE)) EQL %C'z'))
THEN
EXI = 1;
CMD_END = CH$PTR (CMD_BUF, .CMD_LEN, BYTE_SIZE);
END
END
ELSE
BEGIN
!+
! We are not recovering.
!-
!+
! Since we are about to read from the terminal, make sure the last
! line has been written to the journal file.
!-
EXI = EDT$$RD_CMDLN (PMT_HCCHG [1], .PMT_HCCHG [0], CMD_BUF,
CMD_LEN, 255);
CMD_END = CH$PTR (CMD_BUF, .CMD_LEN, BYTE_SIZE);
!+
! Put the new line in the journal file buffer.
!-
IF .EXI
THEN
BEGIN
EDT$$TI_BUFCH (%C'^');
EDT$$TI_BUFCH (%C'Z');
END
ELSE
EDT$$TI_BUFSTR (CH$PTR (CMD_BUF,, BYTE_SIZE), .CMD_LEN);
JOU_VALID = 1;
END;
END
ELSE
BEGIN
!+
! This is not a hard copy terminal.
! Erase the message line, unless it is scheduled to be erased by the next keystroke.
!-
IF (( NOT .MSGFLG) AND .TIN_ECHOFLG) THEN EDT$$ERA_MSGLN ();
!+
! Check for characters in type ahead. Do not update if there
! are more characters to handle.
!-
IF ( NOT EDT$$TI_TSTTYAHED ())
THEN
BEGIN
FIRST_TIME = 0;
!+
! Update the screen.
! In recovery mode we update the screen only 1/10 as often, to make
! recovery go faster.
!-
IF .RCOV_MOD
THEN
BEGIN
RECSCRUPD = .RECSCRUPD - 1;
IF (.RECSCRUPD LEQ 0)
THEN
BEGIN
RECSCRUPD = 10;
EDT$$SC_UPD ();
END
END
ELSE
EDT$$SC_UPD ();
!+
! Re-display the last message we saw before entering change mode.
!-
IF (.OWED_MESSAGE NEQ 1) ! If there is a message
THEN
BEGIN
EDT$$SC_POSCSIF (.MESSAGE_LINE + 1, 0);
EDT$$MSG_BELL (.OWED_MESSAGE);
MSGFLG = 1; ! Erase it on next keystroke
OWED_MESSAGE = 1; ! We no longer owe the message
END
ELSE
BEGIN
!+
! Output a control C message if we owe one.
!-
CASE .CC_MSG FROM 0 TO 2 OF
SET
[0] : ! We don't owe a message
BEGIN
0
END;
[1] : ! The previous operation was aborted by a control C
BEGIN
EDT$$MSG_BELL (EDT$_ABOBYCC);
CC_MSG = 0;
END;
[2] : ! The previous control C was ignored
BEGIN
EDT$$MSG_BELL (EDT$_CTRC__IGN);
CC_MSG = 0;
END;
TES;
END;
!+
! Check for the optimized input applying.
!-
IF ( NOT .RCOV_MOD)
THEN
IF ( NOT EDT$$RD_ECHO ()) THEN EDT$$SC_POSCSIF (.CS_LNO, .CUR_COL);
END
ELSE
IF .FIRST_TIME
THEN
BEGIN
FIRST_TIME = 0;
EDT$$SC_INIT ();
EDT$$SC_ERAALL ();
END;
!+
! Get the next command string.
!-
CMD_PTR = CH$PTR (CMD_BUF,, BYTE_SIZE);
CMD_END = CH$PTR (CMD_BUF, 256, BYTE_SIZE);
IF EDT$$CHK_CC () THEN STATUS = 1 ELSE STATUS = EDT$$GET_KPADCMD ();
END;
IF ((.STATUS EQL 1) AND ( NOT EDT$$CHK_CC ()))
THEN
BEGIN
!+
! Start up the 'working' AST.
!-
IF (.TI_TYP NEQ TERM_HCPY) THEN EDT$$START_WKINGMSG ();
!+
! Execute the command string in CMD_BUF .
!-
CMD_PTR = CH$PTR (CMD_BUF,, BYTE_SIZE);
STATUS = EDT$$CHM_PAREXE (1);
!+
! Turn off the 'working' AST.
!-
IF (.TI_TYP NEQ TERM_HCPY) THEN EDT$$STOP_WKINGMSG ();
END;
!+
! If the control C flag is set, the command was probably aborted by a control C.
! Invalidate the screen (since control C can sometimes cause a scroll) and arrange
! to show an appropriate message.
!-
IF EDT$$CHK_CC ()
THEN
BEGIN
IF (.TI_TYP NEQ TERM_HCPY) THEN SCR_CHGD = 1;
IF .CC_DONE THEN CC_MSG = 1 ELSE CC_MSG = 2;
END
ELSE
CC_MSG = 0;
END;
EDT$$RPL_CHGDLN ();
!+
! Clean up after ourselves. If we will be back here because this is
! just the journal file ending we will put everything back for change
! mode again.
!
! Reset the terminal as required.
!-
EDT$$SC_RESET ();
!+
! Flag that the screen must be rebuilt from the work file. This makes line
! mode more efficient, since it does not need to maintain the screen data base.
!-
SCR_REBUILD = 1;
!+
! Reset the formatted write routine for line mode.
!-
FMT_WRRUT = EDT$$TI_WRLN;
CUR_BUF [TBCB_CHAR_POS] = CH$DIFF (.LN_PTR, CH$PTR (LN_BUF,, BYTE_SIZE));
CMD_PTR = CH$PTR (CMD_BUF,, BYTE_SIZE);
CH$WCHAR (%C'!', .CMD_PTR);
IF (.EXI NEQ 0)
THEN
BEGIN
EDIT_MOD = LINE_MODE;
EXI = 0;
END;
IF (.STATUS EQL 2) THEN RETURN (1) ELSE RETURN (0);
END; ! of routine EDT$$CHM_EXE
END
ELUDOM